Generic IC's - anything to be aware of?

Discussion in 'General Electronics Chat' started by RogueRose, Jun 2, 2015.

  1. RogueRose

    Thread Starter Member

    Oct 10, 2014
    189
    4
    I'm looking for some LM317t's and I have found some that are around $7 made by Ti (http://www.amazon.com/Linear-Voltage-Regulators-ADJUSTABLE-piece/dp/B00MMY22CG/ref=sr_1_10?ie=UTF8&qid=1433279480&sr=8-10&keywords=lm338)and other placves I can get 10-20 for that price, but they seem to be generic Chinese like this:
    http://www.ebay.com/itm/20PCS-LM338...58661&pid=100338&rk=11&rkt=29&sd=191231559551

    Is there anything that I should be aware of before ordering such as tolerance differences and or build quality that may be known by you guys who have dealt with these items for a while now? Thanks
     
  2. paulktreg

    Distinguished Member

    Jun 2, 2008
    609
    120
    It's difficult because you do hear stories of fake semiconductors coming out of China.

    If you are just messing about with electronics as a hobby then they are probably worth a punt. If you have a specific project in mind and reliability is a must then personally I'd pay a little more from a reputable supplier like Mouser, Farnell, Radio Spares, etc.
     
    RogueRose likes this.
  3. RogueRose

    Thread Starter Member

    Oct 10, 2014
    189
    4
    Thanks. I know that some things the generics are pretty much just as reliable as the originals but when it comes to IC's I'm not to much of an expert ATM and was just wondering. Thanks again.
     
  4. michael8

    New Member

    Jan 11, 2015
    18
    2
    The amazon price seems high. Check the price on real electronics distributors like www.digikey.com or www.mouser.com.

    digikey LM338: http://www.digikey.com/product-search/en?x=15&y=12&lang=en&site=us&keywords=LM338T

    so around $2 each for the LM338. Now the amazon link you provided is for a LM338 which is 5A, the LM317 you were asking
    about is lower current and should cost less.

    http://www.digikey.com/product-search/en?x=0&y=0&lang=en&site=us&keywords=lm317t

    So $.70 to $1.85 for the LM317T at digikey. And if you ordered a higher quantity :

    http://www.digikey.com/product-detail/en/LM317TG/LM317TGOS-ND/918508

    less than $.21 each in quantity 1000. So those China prices might be reasonable as they could be
    dealing with thousands of them (they could still be counterfeit or otherwise bad...).
     
    RogueRose likes this.
  5. RogueRose

    Thread Starter Member

    Oct 10, 2014
    189
    4
    Thanks for the reply! I know I quoted the smaller 317, but I found that there wasn't much difference between the price of the 17 and the 38 for the most part and I already had the page and link copied when I was writing - lazy I guess...
     
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